Moz has its own ways of determining if a link/site might be potential spam. As they don't know the disavow data of websites that is something that is not taken into account when calculating Domain Authority. I do believe they take their own measures and calculate that against the Domain Authority/Page Authority metrics.
Also, at some point you need a higher quantity of links, building 10 links over a period of months usually isn't a great signal to search engines that your site needs a boost. If it's just for a specific page, then ignore my comment on it. But usually, I notice that sites need more attention than just building links.